Magnetizable material



Patented Nov. 23, 1926.

UNITED, sTA-TEs PATENT OFFICE.

nuenn'senunnn, oF'co'LoeNE-MULnEm, GERMANY, assrenon. 'ro FELTEN am) commune GABLSWERK ncrrnn GESELLSCHAFT, or conoenn-munnnm, enn- MANY.

MAGNETIZABLE MATERIAL,

' Ho Drawing, Application filed hug'ust '13, 1925, Serial No. 50,143, and in Germany August 80, 1924.

Various alloys have hitherto been proposed which afiter suitable heat treatment show a high permeability and small losses in the case of small magnetizing forces. 5 Such alloys may forinstance be used in the case of signalling lines in the construction bf-thecores of loading coils or in the case of a uniforml loaded conductor in the con-' struction of t e'loading covering. Of. the

i in already known alloys, the alloys the initial permeability of which may be made especially high by suitable annealing, have the" drawback that when they are in acondition capable of being strongly magnetized, their 15 magnetic eiiiciency deterlorates under the mfluence or mechanical actions. For this reason special methods, some of which are complicated, have tobe adopted in order to maintain these alloys in a state in which they so can be highly magnetized, for instance when they are to be used as loading-material for uniformly loaded signalling lines.

According to the present invention the loading material of electric signalling con- 2 ductors is made of an alloy which has favourable' magnetic properties imparted to it also: by suitable heat treatment, which however has the advantage as compared with the known alloys that in the state in which it is capable of being strongly magnetized, it is not so sensitive to mechanical influences as the alloys hitherto proposed for this purpose. It has been found'by experiments that these requirements are fulfilled by an alloy consisting of iron, aluminum and silicon, the

of weak ma proportion of aluminum being greater than that of silicon and the latter being greater .than 0.5%.\Q

t For the. purpose-of the present invention it has been found suitable to use an alloy containing in addition to iron 1% of aluminium and about 0.7% of silicon.

The alloy proposed according to the pres.

.ent invention is known per se.-= However, the

magnetic properties of this alloy in the case etic fields have not yet been investigated with respect to the requirements in signalling conductors. The speclal advantages of these alloys as compared with the alloys hitherto used when employed as loading material for electric signalling conductors have not been known and these alloys have not hitherto been used for the purpose or the present invention. 7

What I claim is:-

l. A loaded signalling conductor theloading material of which consists of an alloy of iron, aluminum and silicon in which the proportion of aluminium is reater than that of silicon and the latter is not less than ,2. A loading ignalling conductor the load= ing material of Which consists of an alloy of iron, aluminium and silicon in which the propertion oi. aluminium is 1% and that of silicon 0.7%,

l'n testimony whereof I have. signed my name to this specification.-

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